You’ll want to check for a manufacture date. This is frequently found on a label on the surface of your system.
If your unit is less than five years old, it could still be protected by a warranty. At the same time, warranty terms and conditions vary between manufacturer and installing company.
At Rob's Albertan Service Experts, we can confirm your warranty state via a system inspection. We also have HVAC service memberships in Edmonton for residential heating and AC equipment, regardless of system age or manufacturer warranty standing.